Integrate REST APIs into GraphQL supergraphs using @source and @connect directives.

• Provides a structured 5-step process: research API structure, implement schema with directives, validate via rover supergraph compose, execute connectors, and test coverage
• Supports request configuration including headers, body payloads, batching for N+1 patterns, and environment variable injection via $env
• Handles response mapping with field selection, aliasing, sub-selections for nested data, and entity relationships for federated types
• Includes schema template, reference files for grammar/methods/variables, and validation rules for selection mapping and literal values